Adhesive Transfer Stamp Structure for Accurate Micro-LED Pickup
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Solution Overview
Problem
The manufacturing process of micro-light-emitting element display devices is cumbersome and costly due to the need for precise transfer of small light-emitting elements, which is prone to errors and damage, and requires complex spring structures and high voltage inputs.
Innovation Solution
A light-emitting element transfer stamp with a stamp substrate, insertion grooves, adhesive layers, a passivation layer, and a buffer layer is used to simplify the transfer process by employing flexible adhesion properties and low-temperature heating control, eliminating the need for complex spring structures and voltage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex spring structure and high voltage input are used to maintain electrostatic force for picking up micro-light-emitting elements, then the pickup capability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent removes the complex spring structure and high voltage input requirements from the transfer stamp system. Instead of using electrostatic force with springs, the invention uses a simple adhesive layer that naturally adheres to micro-light-emitting elements through contact, eliminating the need for complex mechanical and electrical components while maintaining reliable pickup capability
Solution Approach 2:
The patent replaces the mechanical spring system and electrostatic field system with a simple adhesive material system. The adhesive layer provides the necessary holding force through its material properties rather than through mechanical springs or electrical fields, simplifying the overall system architecture
2Reliability
If a complex spring structure and high voltage input are used for picking up micro-light-emitting elements, then the pickup capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent employs a simple adhesive layer that can be easily applied and replaced on the transfer stamp substrate. This approach uses inexpensive adhesive materials rather than expensive springs and high voltage power supplies, significantly reducing manufacturing costs while maintaining functional reliability
Solution Approach 2:
By replacing the expensive mechanical spring system and high voltage electrical system with a simple adhesive material system, the patent dramatically reduces component costs and simplifies the manufacturing process
3Reliability
If high voltage input is applied to maintain electrostatic force, then the pickup capability is improved, but the vulnerability to shorting damage to fine structure increases
Solution Approach 1:
The patent eliminates the high voltage electrical system entirely and replaces it with a passive adhesive material system. This substitution removes the risk of shorting damage to fine micro-light-emitting element structures while maintaining effective pickup capability through adhesive bonding
Solution Approach 2:
The adhesive layer acts as an intermediary between the transfer stamp and micro-light-emitting elements, providing a safe, non-electrical bonding mechanism that avoids the shorting risks associated with direct electrical contact or high voltage fields
4Ease of manufacture
If a stamp substrate is used without adhesive layers and passivation layers, then the manufacturing process is simpler, but the transfer yield decreases due to poor adhesion
Solution Approach 1:
The patent applies adhesive layers selectively at specific locations on the transfer stamp substrate where micro-light-emitting elements will be picked up. This localized application of adhesive material provides precise adhesion control, improving transfer yield while maintaining manufacturing simplicity
Solution Approach 2:
The transfer stamp uses a composite structure combining the substrate material with adhesive material layers. This composite approach integrates the structural support function of the substrate with the adhesion function of the adhesive layer, achieving both good transfer yield and manufacturing simplicity
5Ease of manufacture
If the stamp substrate is used repeatedly without a buffer layer, then the manufacturing cost is reduced, but stress concentration causes spring cracks and surface damage
Solution Approach 1:
The patent introduces a buffer layer between the adhesive layer and the micro-light-emitting elements that absorbs and distributes stress during repeated pickup and release cycles. This cushioning effect prevents stress concentration that would otherwise cause cracks and surface damage, extending the stamp's operational lifetime
Solution Approach 2:
The transfer stamp employs a multi-layer composite structure including substrate, adhesive layer, passivation layer, and buffer layer. Each layer performs a specific function, with the buffer layer specifically designed to protect against stress-related damage during repeated use, thereby extending component lifetime
6Object-affected harmful factors
If low-temperature heating control is used instead of high voltage input, then the safety is improved, but the adhesion control capability may be insufficient
Solution Approach 1:
The patent changes the control parameter from electrical voltage to thermal temperature. By using low-temperature heating to control adhesion, the system achieves effective pickup and release control while eliminating the shorting risks associated with high voltage, maintaining reliability through a safer physical mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution improves transfer yield, reduces manufacturing costs, and enhances pattern accuracy by suppressing lateral contraction and expansion due to heat, thereby increasing the lifetime of the stamp and improving component uniformity.
Implementation Method 1
a plurality of adhesive layers disposed respectively in the plurality of insertion grooves and on the stamp substrate in contact with the insertion grooves
Implementation Method 2
improve the ability to suppress lateral contraction and expansion due to heat
Data Source
AI summary
Discussed are a light-emitting element transfer stamp and a method for manufacturing the same. The light-emitting element transfer stamp can include a stamp substrate, a plurality of insertion grooves provided at regular intervals in the stamp substrate, a plurality of adhesive layer respectively disposed in the plurality of insertion grooves and on the stamp substrate in contact with the insertion grooves, a passivation layer disposed on the stamp substrate between the plurality of adhesive layers, and a buffer layer disposed on a rear surface of the stamp substrate.